Note about git:
	https://isoptera.lcsc.edu/gitweb for current demos

Hud, continued:
	I made a text HUD offline

How to draw text:
	Use a texture, and draw it on something
	More complicated that it seems like it should be

Two ways:
	1.  Bitmaps (this is old and traditional, keep a picture of each letter around0
	2.  Render from truetype.  More work.

I went with #1 above

A picture of all the letters:
	print_letters.c
	Now they're in my terminal font
	The picture will just stay in GPU memory

Coordinates:
	95 letters, 1/95 to move from one to the next
	Formula for a given letter (work it out)

Vertices, and an object to render it on:
	I went with a little panel for each letter
	This makes it easy to change texture coordinates for any letter
	Simple loop to calculate these

Texture coordinates:
	A function for 1 letter:  Based on column, line, and character
	Set array of texture coordinates here
		We'll send the array to the GPU every frame
		It'll be ok...we have PCI express...
		Avoids multithreaded OpenGL (all OpenGL calls are in init or draw)

Shaders:  vertex, fragment is actually a copy of loaded_object's shader
	Let's not draw the black background
		discard
	It also might be nice to take into account the shape of the window
		Why isn't it already?
			glm::perspective in main is normally applied, but not here
			We could pass the ratio into our vertex shader as a uniform
			Let's do it!

Helpers:  It'd be nice to have something like printf
	Except we need to know what line to print to
	lprintf method, va_args, vprintf, etc.

Do we actually want the HUD up all the time?
	Let's add a visible property for objects
	And a key to turn the HUD on and off

Instrumentation!
	First:  What is our framerate?
	Next:  What is an average move looptime?  Player loop time?  Collision detection loop time?

Remaining engine items:	
	geometric objects
		These are intended for a ball bouncing demo
		I'll finish them offline...someday...
	Activate method?  We could make a door with this
	Sound? 
	Performance improvements?  Now that we have instrumentation, we can tell what would help
	Using the other shader types?  The engine does support them so far.
	Locking to a moving platform
	It shouldn't crash at the end

Remaining class topics:
	Lighting (I'm not sure we want to add this to the class engine, though)
	Raytracing
		Could do an active learning on it
	3D math
		Rolling things
		Collisions that use normal vectors
		This might be project 4